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Search Results: 1 - 10 of 183710 matches for " Pierre de Leusse "
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Toward Governance of Cross-Cloud Application Deployment
Pierre de Leusse,Krzysztof Zielinski
Computer Science , 2012,
Abstract: In this article, the authors introduce the main ideas around the governance of cross-Cloud application deployment and their related concepts. It is argued that, due to the increasing complexity and nature of the Cloud market, an intermediary specialized in brokering the deployment of different components of a same application onto different Cloud products could both facilitate said deployment and in some cases improve its quality in terms of cost, security & reliability and QoS. In order to fulfill these objectives, the authors propose a high level architecture that relies on their previous work on governance of policy & rule driven distributed systems. This architecture aims at supplying five main functions of 1) translation of Service Level Agreements (SLAs) and pricing into a common shared DSL, 2) correlation of analytical data (e.g. monitoring, metering), 3) combination of Cloud products, 4) information from third parties regarding different aspects of Quality of Service (QoS) and 5) cross-Cloud application deployment specification and governance.
SOA-based security governance middleware
Pierre de Leusse,Theo Dimitrakos
Computer Science , 2012, DOI: 10.1109/SECURWARE.2010.17
Abstract: Business requirements for rapid operational efficiency, customer responsiveness as well as rapid adaptability are actively driving the need for ever increasing communication and integration apabilities of software assets. In this context, security, although acknowledged as being a necessity, is often perceived as a hindrance. Indeed, dynamic environments require flexible and understandable security that can be customized, adapted and reconfigured dynamically to face changing requirements. In this paper, the authors propose SOA based security governance middleware that handles security requirements on behalf of a resource exposed through it. The middleware aims at providing different security settings through the use of managed compositions of security services called profiles. The main added value of this work compared to existing handlers or centralized approaches lies in its enhanced flexibility and transparency.
Securing business operations in an SOA
Theo Dimitrakos,David Brossard,Pierre de Leusse
Computer Science , 2012,
Abstract: Service-oriented infrastructures pose new challenges in a number of areas, notably with regard to security and dependability. BT has developed a combination of innovative security solutions and governance frameworks that can address these challenges. They include advances in identity federation; distributed usage and access management; context-aware secure messaging, routing and transformation; and (security) policy governance for service-oriented architectures. This paper discusses these developments and the steps being taken to validate their functionality and performance.
A common interface for multi-rule-engine distributed systems
Pierre de Leusse,Bartosz Kwolek,Krzysztof Zielinski
Computer Science , 2012,
Abstract: The rule technological landscape is becoming ever more complex, with an extended number of specifications and products. It is therefore becoming increasingly difficult to integrate rule-driven components and manage interoperability in multi-rule engine environments. The described work presents the possibility to provide a common interface for rule-driven components in a distributed system. The authors' approach leverages on a set of discovery protocol, rule interchange and user interface to alleviate the environment's complexity.
Self Managed Security Cell, a security model for the Internet of Things and Services
Pierre de Leusse,Panos Periorellis,Theo Dimitrakos,Srijith K. Nair
Computer Science , 2012, DOI: 10.1109/AFIN.2009.15
Abstract: The Internet of Things and Services is a rapidly growing concept that illustrates that the ever increasing amount of physical items of our daily life which become addressable through a network could be made more easily manageable and usable through the use of Services. This surge of exposed resources along with the level of privacy and value of the information they hold, together with the increase of their usage make for an augmentation in the number of the security threats and violation attempts that existing security systems do not appear robust enough to address. In this paper, the authors underline this increase in risk and identify the requirements for resources to be more resilient in this type of environment while keeping an important level of flexibility. In addition, the authors propose an architectural model of Self Managed Security Cell, which leverages on current knowledge in large scale security systems, information management and autonomous systems.
Secure & Rapid Composition of Infrastructure Services in the Cloud
Pierre de Leusse,Panos Periorellis,Paul Watson,Andreas Maierhofer
Computer Science , 2012, DOI: 10.1109/SENSORCOMM.2008.130
Abstract: A fundamental ambition of grid and distributed systems is to be capable of sustaining evolution and allowing for adaptability ((F. Losavio et al., 2002), (S. Radhakrishnan, 2005)). Furthermore, as the complexity and sophistication of theses structures increases, so does the need for adaptability of each component. One of the primary benefits of service oriented architecture (SOA) is the ability to compose applications, processes or more complex services from other services which increases the capacity for adaptation. This document proposes a novel infrastructure composition model that aims at increasing the adaptability of the capabilities exposed through it by dynamically managing their non functional requirements.
On the effectiveness of mixing in violent relaxation
Pierre de Buyl,Pierre Gaspard
Physics , 2011, DOI: 10.1103/PhysRevE.84.061139
Abstract: Relaxation processes in collisionless dynamics lead to peculiar behavior in systems with long-range interactions such as self-gravitating systems, non-neutral plasmas and wave-particle systems. These systems, adequately described by the Vlasov equation, present quasi-stationary states (QSS), i.e. long lasting intermediate stages of the dynamics that occur after a short significant evolution called "violent relaxation". The nature of the relaxation, in the absence of collisions, is not yet fully understood. We demonstrate in this article the occurrence of stretching and folding behavior in numerical simulations of the Vlasov equation, providing a plausible relaxation mechanism that brings the system from its initial condition into the QSS regime. Area-preserving discrete-time maps with a mean-field coupling term are found to display a similar behaviour in phase space as the Vlasov system.
Sample Size Determination and Statistical Hypothesis Testing for Core Centration in Press Coated Tablets  [PDF]
Pierre Lafaye de Micheaux, Vincent Lemaire
Open Journal of Statistics (OJS) , 2012, DOI: 10.4236/ojs.2012.23032
Abstract: A novel statistical approach to evaluate the manufacturing quality of press coated tablets in terms of the centering of their core is presented. We also provide a formula to determine the necessary sample size. This approach is applied to real data.
Situation de la sociologie
Pierre de Bie
SociologieS , 2010,
Abstract: Texte de Pierre de Bie initialement publié dans le Bulletin de l'Institut de recherches économiques et sociales, vol. 21, n°7, 1955 et reproduit avec l’aimable autorisation de la revue. Pierre de Bie’s text first published in 1955 in Bulletin de l'Institut de recherches économiques et sociales, vol. 21, n°7, and published here with the kind authorization of the journal. Texto de Pierre de Bie publicado por primera vez enBulletin de l'Institut de recherches économiques et sociales, vol. 21, n°7, 1955 y aquípublicado con la amable autorización de la revista.
A judicial revolution? The court-led achievement of same-sex marriage in South Africa
Pierre de Vos
Utrecht Law Review , 2008,
Abstract: This article maps the legal developments that led to the adoption of the Civil Union Act, which extended full marriage rights to same-sex couples in South Africa. It points out that this extension of marriage to same-sex couples would not have been possible if it was not for the groundbreaking decisions on sexual orientation discrimination handed down by the South African Constitutional Court over the past ten years. It al so describes the complex legal regime now in place which allows different sex couples to enter into marriage in terms of a traditional Marriage Act or the new Civil Union Act but restricts same-sex couples to entering into marriage in terms of the latter Act. The article concludes that while this extension of marriage rights can be viewed as a legal revolution, some problems remain with the legal regulation of same-sex relationships in South Africa.
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